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CryptoHack

A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 lydxn 3285
#2 Mahalakshmi 1830
#3 johnblack 1820
#4 kdm 1730
#5 fuzzli 1620
Recent Solves
Euler's Totient yelime
XOR Properties Fiel
Hex glebster
Public Keys yelime
ASCII glebster
Recent Solutions
Public Keys onuronuronur123 0
Pad Thai D0pp3lgang3r 2
Encoding Challenge davkk 0
Modular Inverting m3h3d1 0
Extended GCD m3h3d1 0

Level Up

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